Portable filter



Feb. l0, 1948.

J. R. GRANDIN 15T/u.l

PORTABLE FILTER Filed Feb. 26, 1944 Patented Feb. 10, 1948 PATENT' OFFICE atentar romain-E FMF-,1t

Applicatie, Febrarr $6, 1944, Serial Na 524,116.0. CL Zlqlfw,

The invention relates'to nl ters. @and more Paliticularly to a snall fcopadtwnd 'fradil t1 portable lter suitable 'for troops, eliipl'fers a d the like: A n

The` principal object .ot ythe invention generally stated is to provide a portable filter in which all of the lteringfelementsarefmpregnated with a colloidal coating of` a germC-e., whereby the apparatus'not only will clarify 'the l"water'or other. portable uid, but will at the Sametime purify the same by materially reducirig'if not entirely eliminating, the bacteria contentrthereof to render such'water or other portable fluid siii "ble for human consumption;

"Still another bbj'ctfthe inventiton is to provide a collapsible lter'inf'whleh 1"plurality or `1` terehamters' and' a clear i nested into a' cempacturntl `may easiiyfand quickly be assembled ordis mfbld Witlfiut'ln.. j nry te the niterlmeehamsnfit a 'tweeen or nie beneneial'efrects ofthemterf Still another"objectv ofthe invention is to provide in a 'filter ofthe typ'de ed, a conplete and compact unit' including a""s'iiitable"puinp adapted to draw waterfni'ay's'ource and to convey the same into the nrstof a series of filter chambers, the lowermost chamberbeing notl'only adapted toiecivet'h "ltj d but thave means connected' ther' EI by thejfj'ltred artid maybe dispense an easi1gff""' 'fre 'theseand "thegends t ,Ventron comprises tlievaious eleniefnt a y p'rnbinations of elements hereinafter srfththe-novei features thereof being pointed out in the appended claim.

In the drawing, which has been selected to illustrate a single embodiment of the invention:

Figure 1 is a sectional view of the lter assembled in operative relationship; and

Figure 2 is a similar sectional view illustrating I the lter packed for transportation.

Throughout the drawing and the specification, like parts of the'invention have been designated by like characters.

Y The lter comprises a top or cover I having connected thereto a pump 2 which may, as illustrated, comprise a centrifugal pump having a discharge orice 3 leading through the cover I, and having an intake connection 4 which preferably terminates in a fitting 5 adapted to receive a hose or other tube 6, the latter having at its opposite end a. strainer 'I adapted to be immersed in the source of iluid. The cover I is provided with a liange 8 adapted to be connected or disconnected l from the upper chamber 9 by means of lugs Iii which are adapted to enter slots II in the flange f is adapted to haveinounted therein a gasket memberl'against which sats preferably a disc I6 formed -of porcelaifn'or 'the'likeg 'and used for liltering'purposes; "The :disc 'IB is maintaineed in Water-tight relation with the gasket l5 by means f the springfspider'll;'thends ofthe spider being 'adapted to engage countersunk shoulders I 8 inthewall of. the'co'iitainer or chamber 9. The numeral 'i9 desighatesan intermediate chamber having at its uppar' n'd f2.0 an exteriorly threaded portion 2| adapted t'o""threadedly Vengage the threads l4 a of the upper chamber 9. At its lower end the charnb'erfli's"provided with a shoulder portion z2 havinga simnarrgasket l5 en which is adapted to seat'fasecgnd porcelain or other suitable'lter 'dSc `23.'""-The latter is likewise maintainedin watertight relation by means v,nf aspid'er'24, lthe endsoi 'which engage countersunk recesses 2.5in the'interlor walls of the chamber I9. Secured'to thetQp of the` chamber I9 is afwire mesh'zt"aditerpqsedbetween the wire mesh andthe'uppser jfacefo'fithe 'disc 23 we preferably "place a plualityof'granules of lltermaterial, such as fiorite, fichiis ariactivated naturalbaujrite. The' 'size ofthe granules is such as will'pass through 3Q/@standard mesh screen. Other 'suitabl'e`ltring y'material such as .Floridin, the trade name for fullers earth'produced in Florida or Georgia, or Florisil, the trade name for synthetic magnesium silicate, may be used.

Adjacent the shoulder portion 22 of the chamber I9 we provide the same with an exterior downwardly tapered portion 21 forming an upwardly facing shoulder 28 4and when the filter is assembled the chamber 29 having in its upper inner circumference a corresponding beveled portion 30, is adapted to have a sliding iit with the inclined surface 21 of the chamber I9 and these surfaces are preferably ground so as to make a Watertight joint. The chamber 29 is closed at its bottom and is provided with an opening 3I which is preferably threaded to receive the fitting on a pipe or tube through which the ltered fluid may be dispensed.

It will be obvious from an inspection of the drawing that the chamber I9 with its filter contents can be readily disconnected from the cham- 29 being such that when engaged with the shoul der 28 the lower surface 32 of the chamber 29 will engage the inner face of the top or cover l of the chamber 9 when the same is assembled withv v, the chamber 9. This makes a compact unit whichis easily transported and the parts are clamped in position between the filter disc I 6 and the cover I of the chamber 9 and may be easily assem bled without the use of tools or other equipment, Preferably, as stated in one of the objects of the invention, the porcelain discs I6 and 23 as well as the granular filter material, are impregnated with a colloidal coating of metals in any other well known manner in order to provide the same with certain well known germicidal proper? ties. It is well known that filter discs as Awell as granular lter material, unless constantly cleansed by baking or other suitable means, tend to become impregnated with bacteria to the detriment of the fluid filtered therethrough. It is also well known that where theporesof the filters either of disc or granular form are provided with colloidal coating of metal such as gold, silveror copper or alloys of the same, thatthe metals have a germicidal property which not only pre- Vents the growth of bacteria but acts effectively to kill bacteria passing through the pores of the lter'.

Repeated tests have shown that water high in bacteriar count when passed through lters having elemental silver, gold or copper deposited as a colloidal film in the poresv thereof, i-s substantially free of bacteria and, further, it was found that in water after being Afiltered which is allowed to stand for a period of vtime that the bacteria which may have survived thepassage through the filter has, by reason of contact with the elemental metal, maintained suicient germicidal property to destroy the remaining bacteria leaving the water purified and palatable.

We make no claim to the colloidal treatment of the lter material except in combination with the particular design of filter ,herein shown and described.

We claim:

In a collapsible filter assembly, the combination of a chamber open at both ends, a cover having an inlet port and interlockingly secured to one end of said chamber, a resilient gasket adjacent another end of said chamber, a porous disk seated upon said gasket and closing the associated end of said chamber, means -interlocked with said chamber and urging said disk into tight engagement with said gasket, a second chamber open at both ends, one end of said second chamber being interlocked with an end of said rst chamber,

granular lter material Within said second chamber, a yieldable. gasket adjacent an end o said second chamber removed from said first chamber, a second porous diskvseated upon said yieldable gasket, means interlocked with said second chamber and urging said second porous disk into tight engagement with said yieldable gasket, a third chamber having an outlet port and closed at one end only, and another end of said third chamber interlocked and communicating with said second chamber.

JAMES R. GRANDIN. ERNEST F. MECHLIN.

'REFERENCES CITED The following references are of record in the le of this patent:

, UNITED STATES PATENTS Number Name Date 1,000,332 Dyer Aug. 8, 19114 2,008,131 vDieck July 16, 1935 2,283,883 Conconi May 19, 1942 2,299,182 Schoof Oct. 20, 1942 2,300,259 Keuppers Oct. 27, 1942 855,820 `Stebbins June 4, 1907 1,997,830 Michaud Apr. 16, 1935' 1,988,246 Krause Jan. 15, 1935 1,547,855 Burson July 28, 1925 2,202,055 Juia, May 28, 1940 1,685,204 Schreier Sept. 25, 1928 FOREIGN PATENTS Number Country Date 11,035 Great Britain Sept. 20, 1887 17,363 v'Germany Mar. 10, 1882 333,000 France Nov, 12, 1903 9,599 v Great Britain May 24, 1900 25,730 Great Britain 1913 18,287 Great Britain 1896 

